hey carz i might be able to help you out.I have a few ideas because i had problems in my primary.your chain might be bouncing off the primary case.this means your chain might need to be tightened.there is a chain tensioner door on your primary take the screws out and the cover off and you will see the chain put your fingers on the chain and if you have alot of play chances are its rattling against the outer case.you can adjust the chain right there.If thats not it it might be your compensater sproket i hope i helped you good luck.if it rattles when u give it gas and the bike is parked and in neutral than chances are its the chain
